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全球鸟类数量正在急剧衰减，由于缺乏关于鸟类种群变化趋势精细尺度的空间综合数据，人们难以确定保护工作的优先顺序。2025年5月1日，《Science》上的一项研究指出，北美鸟类种群数在那些鸟类数量仍属最多的地区正以最快的速度衰减。

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